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Problem DepartmentM. S. Robertson, Johannes Mahrenholz, H. S. Grant, W. C. Janes, Robert C. Yates, B. A. Hausmann, E. C. Kennedy, Daniel Arany, Frank Ayres, Jr., Nathan Altshiller-Court, C. W. Trigg, V. Thebault, John Ellis Evans, W. V. Parker, Howard D. Grossman, Paul D. Thomas and Walter B. Clarke · National Mathematics Magazine · 1940